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At the present time, 98 percent of the world energy consumption comes from stored sources, such as fossil fuels or nuclear fuel. Only hydroelectric and wood energy represent completely renewable sources on ordinary time scales.Discovery of large additional fossil fuel reserves, solution of the nuclear safety and waste disposal problems, or the development of controlled thermonuclear fusion will provide only a short-term solution to the world’s energy crisis. Within about 100 years, the thermal pollution resulting from our increased energy consumption will make solar energy a necessity at any cost. Man’s energy consumption is currently about one part in ten thousand that of the energy we receive from the sun. However, it is growing at a 5 percent rate, of which about 2 percent represents a population growth and 3 percent a per capita energy increase. If this growth continues, within 100 years our energy consumption will be about 1 percent of the absorbed solar energy, enough to increase the average temperature of the earth by about one degree centigrade if stored energy continues to be our predominant source. This will be the point at which there will be significant effects in our climate, including the melting of the polar ice caps, a phenomenon which will raise the level of the oceans and flood parts of our major cities. There is positive feedback associated with this process, since the polar ice cap contributes to the partial reflectivity of the energy arriving from the sun:As the ice caps begin to melt, the reflectivity will decrease, thus heating the earth still further. It is often stated that the growth rate will decline or that energy conservation measures will preclude any long-range problem. Instead, this only postpones the problem by a few years.Conservation by a factor of two together with a maintenance of the 5 percent growth rate the problem by only 14 years. Reduction of the growth rate to 4 percent postpones the problem by only 25 years; in addition, the inequities in standards of living throughout the world will provide pressure toward an increase in growth rate, particularly if cheap energy is available. The problem of a changing climate will not be evident until perhaps ten years before it becomes critical due to the nature of an exponential growth rate together with the normal annual weather variations. This may be too short a period to circumvent the problem by converting to other energy sources, so advance planning is a necessity. The only practical means of avoiding the problem of thermal pollution appears to be the use of solar energy. (Schemes to "air-condition" the earth do not appear to be feasible before the twenty-second century. ) Using the solar energy before it is dissipated to heat does not increase the earth’s energy balance. The cost of solar energy is extremely favorable now, particularly when compared to the cost of relocating many of our major cities. |
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Whenever you see an old film, even one made as little as ten years ago, you cannot help being struck by the appearance of the women taking part. Their hairstyles and make-up look dated; their skirts look either too long or too short; their general appearance is, in fact, slightly ludicrous. The men taking part in the film, on the other hand, are clearly recognizable. There is nothing about their appearance to suggest that they belong to an entirely different age. This illusion is created by changing fashions. Over the years, the great majority of men have successfully resisted all attempts to make them change their style of dress. The same cannot be said for women.Each year a few so-called top designers’ in Paris or London lay down the law and women the whole world over rush to obey. The doctrines of the designers are unpredictable and dictatorial. This year, they decide in their arbitrary fashion, skirts will be short and waists will be high; zips are in and buttons are out. Next year the law is reversed and far from taking exception, no one is even mildly surpriseD、 If women are mercilessly exploited year after year, they have only themselves to blame.Because they shudder at the thought of being seen in public in clothes that are out of fashion, they are annually blackmailed by the designers and the big stores,Clothes which have been worn only a few times have to be discarded because of the dictates of fashion. When you come to think of it, only a woman is capable of standing in front of a wardrobe packed full of clothes and announcing sadly that she has nothing to wear. Changing fashions are nothing more than the deliberate creation of waste. Many women squander wast sums of money each year to replace clothes that have hardly been worn. Woman who cannot afford to discard clothing in this way waste hours of their time altering the dresses they have. Hem-lines are taken up or let down; waist-lines are taken in or let out; neck-lines are lowered or raised, and so on. No one can claim that the fashion industry contributes anything really important to society. Fashion designers are rarely concerned with vital things like warmth, comfort and durability. They are only interested in outward appearance and they take advantage of the fact that women will put up with any amount of discomfort providing they look right. There can hardly be a man who hasn’t at some time in his life smiled at the sight of a woman shivering in a flimsy dress on a wintry day, or delicately picking her way through deep snow in dainty shoes. When comparing men and women in the matter of fashion, the conclusions to be drawn are obvious.Do the constantly changing fashions of women’s clothes, one wonders, reflect basic qualities of fickleness and instability Men are too sensible to let themselves be bullied by fashion designers.Do their unchanging styles of dress reflect basic qualities of stability and reliability That is for you to decide. |
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Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries. Yet much had happened{{U}} (21) {{/U}}.As was discussed before, it was not{{U}} (22) {{/U}}the 19th century that the newspaper became the dominant pre-electronic{{U}} (23) {{/U}}, following in the wake of the pamphlet and the book and in the{{U}} (24) {{/U}}of the periodical. It was during the same time that the communications revolution{{U}} (25) {{/U}}up, beginning with transport, the railway, and leading{{U}} (26) {{/U}}through the telegraph, the telephone, radio, and motion pictures{{U}} (27) {{/U}}the 20th-century world of the motor car and the air plane. Not everyone sees that process in{{U}} (28) {{/U}}. It is important to do so. It is generally recognized,{{U}} (29) {{/U}}, that the introduction of the computer in the early 20th century,{{U}} (30) {{/U}}by the invention of the integrated circuit during the 1960s, radically changed the process,{{U}} (31) {{/U}}its impact on the media was not immediately{{U}} (32) {{/U}}.As time were by, computers became smaller and more powerful, and they became "personal" too. as well as{{U}} (33) {{/U}}, with display becoming sharper and storage{{U}} (34) {{/U}}increasing. They were thought of, like people,{{U}} (35) {{/U}}generations, with the distance between generations much smaller. It was within the computer age that the term "information society" began to be widely used to describe the context within which we now live. |
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